Woven elastic fabric



April 17, 192s.

1,666,325 L. B. cHlsHoLM WOVEN ELASTIC FABRIC Filed May 15. 1926 Fi E 1f 2 3 4 f Patented Apr.'17,p19128.

UNITED STATES PATENT oFFlcE.

LESTER B.' CHISHOLI, OF MELROSE, MASSACHUSETTS, ASSIGNOB T0 EVEBLASTIX,

vINC., F CHELSEA, MASSACHUSETTS,

A CORFOBATION 0F IASSACHU'SETTS,

wovaN ELasrIc lunare.

' Application illed Hay 15, 1926. Serial`1l'o. 109,885.

10 4stood I- by reference to the drawings in which A Figure 1 is a`conventional plan in enlar ed detail of a woven elastic fabric embo yingthe invention, the web being shown l5 4strtched to the limit as it iswhen woven,

Fig. 2 is a plan the sameas Fig. 1 excepting that the web is shownpartially contracted. I Inthe drawin :'-f

1, 2, 3,4 an 5 indicate a number of elastic warp strands'representativeof those is, the right-twisted warp threads 12 and 14 pass over thepicks 6, 8 and 10 and under the picks 7 and 9, while the left-twistedwarp threads 12 and 14 pass over the picks 7 and 9 and under-the picks6, 8 and 10.

In consequence', when the web contracts the binder warp threads beingtwisted so,

hard that they cannot be compressed, kink and automatically curl` withdisplacement to the right and left along the picks. The right-twistedthreads 12 and 14 will `,swing to the left where they pass over thepicks and to the right where they ass under the picks, while theleftftwiste threads will swing to thev right wherel they pass over thepicks and to the-leftwhere theypass under the picks.

warp will not interfere in the sense of lessening or dulling any normalor proper stretch of the elastic strands especia ly at the bein thewovenfabric. gThesesstrands"areallnginning of their action inasmuch" as thewound or covered elastic strands like those customarilypemployed in anelastic woven fabric.

6, 7, 8,- 9 and 10 indicate a number of wefts or picks which cross theelastic strands at the back 'and are representative of the picks in thewoven structure.

Each elastic war strand is bound to all the picks by a leno thread 11whichpasses alternately back and forth overthe strand and la s underalternate-picks n opposite sides ci) the strand.

12, 13, 14 and 15y indicate binder warp threads representative of thosein the woven structure. These threads are interwoven with the pick tolie between each pair of elastic strands. They are all excessively Ahardtwisted threads; a twist about three times the normal warp twist ispreferably employed. vOf these threads, the threads 12 and 14 areright-twisted threads and the The threads are arranged in such mannerthat a right-twisted thread will alternate with a left-twisted thread ina direction bdin'gr'or curling of the binder warp threads lwhen theelastic strands are contracted displaces the binder warp threadslaterally away from 'the elastic strands, the binder warp threads onlyinterfering to prevent more than a proper or normal stretch of theelastic. As there is no compression of the binder thread and hence nofriction between the fibres, the web has unusual life or kick and comesback hard against the filling or pick. The web is, also peculiarly .softand pliable owing to the iiexlble character of the binder warpespecially when the web is contracted,- and the fact that the binderwarp then has only loose engagement with the respective picks orfilling.

Having thus fully described my invention, I claim and desire to secureby Letters Patent of the United States 1.V In a woven elastic fabric,the combination comprising elastic warp strands,

through the picks in the space between the elastic strands, said binderwarp threads being suiciently hard twisted-to kink and An elasticwebbing thus formed possesses peculiarly desirable properties. Thebinder M threads 13 and15 are left-twisted threads. picks, and binderwarp threads woven 100 lengthwise the picks. In other words, itautomatically curl with lateral displacement will be observed that `theright-twisted away from the elastic strands when the'elas- 105 thread 12is followed by a left-twisted thread'13 and a right-twistedthread 14 isfollowed b a'left-twisted thread 15. The right and eft twisted threadspass respectively over under alternate picks, that bination comprisingelastic warp strands, 1,10

tic strands are contracted to -an amount permitted by the drawingtogether of theA picks.

2. In a woven elastic fabric, the comstrands are contracted to an amountpermit-- ted by the drawing together of the picks, certain of saidbinder warp threads having a right twist and certain of said binder warpthreads having a left twist. 7

A3. In a woven elastic fabric, the com,- binatifon comprising elasticwarp strands,

picks, and binder warp threads woven' through the picks in the spacebetween the elastic strands, said binder warp threads being suilicientlyhard twisted to kink and automatically curl with llateral displacementto the right and left along the plcks away from the elastic strandswhen' the elastic, strands are contracted an amount permitted` bythedrawing together of the picks7 certain of said binder warp threadshaving a rightv twist and certain of said binder Warp threads having aleft twist, said right and left twisted binder Warp threads beingvalternately arranged' in `the weave and being woven to cross over andunder, respectively, alternate picks.

LESTER B. CHISHOLM.

